For the purposes of the present document, the following definitions apply:
The prevention of unauthorised use of a resource, including the prevention of use of a resource in an unauthorised manner 
The provision of assurance of the claimed identity of an entity .
The process of changing the identity of one entity to that of an entity of the same type, so that there are two entities of the same type with the same identity.
The property of information that it has not been disclosed to unauthorised parties.
The property of information that it has not been changed by unauthorised parties.
Law Enforcement Agency (LEA):
The administration and use of the generation, registration, certification, deregistration, distribution, installation, storage, archiving, revocation, derivation and destruction of keying material in accordance with a security policy 
An organisation authorised by a lawful authorisation, based on a national law, to receive the results of telecommunication interceptions 
Permission granted to an LEA under certain conditions to intercept specified telecommunications and requiring co-operation for a network operator or service provider. Typically this refers to a warrant or order issued by a lawfully authorised body 
The action (based on the law), performed by a network operator or service provider, of making available certain information and providing that information to a Law Enforcement Monitoring Facility 
A security service which counters the threat of repudiation.
Denial by one of the parties involved in a communication of having participated in all or part of the communication 
For the purposes of the present document, the following abbreviations apply:
Global System for Mobile communications
International Mobile Equipment Identity
International Mobile Telecommunications-2000
International Mobile User Identity
Integrated Services Digital Network
International Telecommunications Union
Personal Identification Number
Public Switched Telephone Network
Subscriber Identity Module
Time Division - Code Division Multiple Access
Telecommunications Management Network
Universal Integrated Circuit Card
Universal Mobile Telecommunication System
Universal Personal Telecommunication
User Services Identity Module
UMTS Terrestrial Radio Access Network
Virtual Home Environment
Wideband - Code Division Multiple Access